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is a significant concern for physicians. Central' d# L2 D- ], [4 w0 o) ~
precocious puberty (CPP), which is mediated8 C0 |" D" }# {$ L
through the hypothalamic pituitary gonadal axis, has
( _3 I5 _' Z( S6 w o. G6 `a higher incidence of organic central nervous system% U) B9 R4 u$ N2 ?
lesions in boys.1,2 Virilization in boys, as manifested
1 g$ x, ~& L' i/ r5 d& Bby enlargement of the penis, development of pubic' E. @% Y! Q5 @& u
hair, and facial acne without enlargement of testi-. h1 y( x! ^# g' i
cles, suggests peripheral or pseudopuberty.1-3 We
: x" R4 f5 J) l3 o2 Lreport a 16-month-old boy who presented with the" Y+ ~, \ Y" S* w. K
enlargement of the phallus and pubic hair develop-$ G) D( H% R7 ]' [% J
ment without testicular enlargement, which was due
6 J3 u. {9 U/ S# U3 mto the unintentional exposure to androgen gel used by
4 U6 P& t5 a! z g+ I9 _' C+ v# Xthe father. The family initially concealed this infor-3 P, B) k, f D' Y* {: v
mation, resulting in an extensive work-up for this5 E. o0 z( i, W- S3 p+ Z
child. Given the widespread and easy availability of
1 _5 J6 Z& C# N8 Htestosterone gel and cream, we believe this is proba-; w3 s3 j# b) l0 y1 k d8 b
bly more common than the rare case report in the8 C5 F3 k H, k3 G) b
literature.4( V1 v a( l# \4 O1 q
Patient Report
8 H9 B& s- r8 F& T) ?# B* ^7 [/ FA 16-month-old white child was referred to the4 ^& a" w8 i( s
endocrine clinic by his pediatrician with the concern
% p, r( E a6 _7 x! F! e6 Y/ H, bof early sexual development. His mother noticed
$ w0 v9 o2 A4 s% w9 d Flight colored pubic hair development when he was) V* _" ^% W: K l. a( l8 U# L* Y% \
From the 1Division of Pediatric Endocrinology, 2University of6 z# E: S [5 O5 ?$ L
South Alabama Medical Center, Mobile, Alabama.$ [8 R& ^6 Q8 g% L3 ?* _
Address correspondence to: Samar K. Bhowmick, MD, FACE,
* N( V: T/ Z6 k7 oProfessor of Pediatrics, University of South Alabama, College of, f8 y* k7 N) L" N3 Z6 F/ I( B
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
: @/ |4 {+ i2 ?; U Y% ]e-mail: [email protected].6 B/ K! F& f2 U+ }
about 6 to 7 months old, which progressively became
7 m* @/ V* f7 o0 Sdarker. She was also concerned about the enlarge-
! [7 c) T: f: o3 N* T- z F* `4 pment of his penis and frequent erections. The child( }* z$ w2 D/ H7 p# F6 @9 B
was the product of a full-term normal delivery, with- q0 o+ ?& m9 L3 }6 j/ ?. k4 i
a birth weight of 7 lb 14 oz, and birth length of" ]: J* g% V- g0 u8 l
20 inches. He was breast-fed throughout the first year) Y8 @- Z1 A. Z% G* e
of life and was still receiving breast milk along with3 T- M4 X4 u9 F. v2 ?( U, k
solid food. He had no hospitalizations or surgery,
2 W& N _+ U$ k5 r0 zand his psychosocial and psychomotor development: [" l! O+ [+ J, j
was age appropriate.
( E, q4 K- z- q! J$ Y- gThe family history was remarkable for the father,
8 Z8 F3 m/ T2 N; s. Awho was diagnosed with hypothyroidism at age 16,) q7 h" ]6 G* w" h+ w! Z, L
which was treated with thyroxine. The father’s$ Z) w/ D" n, i( r/ [% c
height was 6 feet, and he went through a somewhat
& D: f& i" v* |- v% \* f/ uearly puberty and had stopped growing by age 14.
& p: Y% e S/ NThe father denied taking any other medication. The
- y- |5 `: [3 m" ^7 O- ychild’s mother was in good health. Her menarche
9 N. `, y! g0 A! U2 K9 Ywas at 11 years of age, and her height was at 5 feet, H( m5 o9 h% ]: L
5 inches. There was no other family history of pre-
- k1 M' ^: O- ?4 Q0 C6 @& |cocious sexual development in the first-degree rela-1 a8 _ m* n$ }( K0 |/ p
tives. There were no siblings.
9 w# } c) R- w3 i+ x8 SPhysical Examination% J |, ]0 E/ T5 G6 h6 |' `
The physical examination revealed a very active,
' f) ]5 `: e* h) a2 h; gplayful, and healthy boy. The vital signs documented/ a, h( u! C/ u; F' \
a blood pressure of 85/50 mm Hg, his length was
4 u, j' n; J. U4 [9 s! n90 cm (>97th percentile), and his weight was 14.4 kg
* X0 E% m+ z# k; B(also >97th percentile). The observed yearly growth
7 O1 T% Q! q; q6 Gvelocity was 30 cm (12 inches). The examination of
# @! V1 G" ]) B4 jthe neck revealed no thyroid enlargement.9 S c2 S" ]. F
The genitourinary examination was remarkable for
) ~8 S8 q" a+ U/ m. Wenlargement of the penis, with a stretched length of. l$ r8 g6 I! V. X
8 cm and a width of 2 cm. The glans penis was very well
% @6 V* q+ K. d: W' xdeveloped. The pubic hair was Tanner II, mostly around
6 O+ D6 O' l m6 y540
5 T z0 z8 y) S$ o) Z2 o! |$ sat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
( |) R" x; z9 h! }( {) J! }7 dthe base of the phallus and was dark and curled. The5 _7 z. l J& r9 I+ B5 ^+ x u+ }; B
testicular volume was prepubertal at 2 mL each.+ g9 s$ A W z9 k+ G* B7 _
The skin was moist and smooth and somewhat
/ J& y! N: y. m7 [+ Voily. No axillary hair was noted. There were no
. y0 F; W: ?% ?+ B( o5 F7 Iabnormal skin pigmentations or café-au-lait spots.- T, ]4 p6 p( z! A
Neurologic evaluation showed deep tendon reflex 2+/ z2 m) \1 Q& V- P, k
bilateral and symmetrical. There was no suggestion
8 A3 [/ O; Z; `! f. [* [4 C8 T+ fof papilledema.$ W1 C5 K8 ~2 M3 t
Laboratory Evaluation
( o6 W( S6 a# B9 b/ i! KThe bone age was consistent with 28 months by* q- v2 X! G6 [7 ]$ o' s
using the standard of Greulich and Pyle at a chrono-1 B+ K* T9 @5 O# ^1 Z3 Q5 D
logic age of 16 months (advanced).5 Chromosomal
6 S: w9 I9 B4 Bkaryotype was 46XY. The thyroid function test
& c% d. x) w& e/ eshowed a free T4 of 1.69 ng/dL, and thyroid stimu-! i3 ?. q( P; x! X7 N
lating hormone level was 1.3 µIU/mL (both normal).$ Z( {0 @7 g* o4 v
The concentrations of serum electrolytes, blood
7 K- W$ J( J& T4 M2 v- furea nitrogen, creatinine, and calcium all were5 R& P* |" l0 {( s% E9 P2 L. X x
within normal range for his age. The concentration& t$ L4 E- t" {: `" W
of serum 17-hydroxyprogesterone was 16 ng/dL
! j3 c" L/ P0 ~(normal, 3 to 90 ng/dL), androstenedione was 20
5 ?. j# [& Y9 @% m: Ung/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
& _, R7 {0 a9 P$ \$ F# Q& o: o1 wterone was 38 ng/dL (normal, 50 to 760 ng/dL),: H$ I& J# V4 J; w3 j2 f0 v5 j& H
desoxycorticosterone was 4.3 ng/dL (normal, 7 to3 X- L- i8 A1 f3 u1 }. ^/ Y( c
49ng/dL), 11-desoxycortisol (specific compound S)
- p2 f% P) C+ w6 Uwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-$ Z3 @& Y4 `2 r+ x1 P/ j: Q
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
4 E% y4 ~" u: xtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),& R1 z+ [# H. Z* D/ ~0 l
and β-human chorionic gonadotropin was less than' q: y% x6 G7 q8 H9 A& I; x
5 mIU/mL (normal <5 mIU/mL). Serum follicular
6 a$ w( K4 I/ A- k. u. `stimulating hormone and leuteinizing hormone W4 U; m& o) `4 {: D# I$ @
concentrations were less than 0.05 mIU/mL
+ g/ A: L/ Q3 T(prepubertal).! Q) `* g$ i9 m1 \3 @/ E& L
The parents were notified about the laboratory( D# b7 F$ g8 I! d8 t
results and were informed that all of the tests were
, l3 |9 w' W0 ^! `$ Nnormal except the testosterone level was high. The
, A) v9 M3 R" e$ R- yfollow-up visit was arranged within a few weeks to
8 r- j) b0 r- jobtain testicular and abdominal sonograms; how-; u$ X! f5 X" w* n" V
ever, the family did not return for 4 months.
9 c* j. i* b7 {* W9 \; gPhysical examination at this time revealed that the2 P" K7 J" R. y* k! l
child had grown 2.5 cm in 4 months and had gained7 h& M: e; L; S6 r2 x4 p* g1 X1 m
2 kg of weight. Physical examination remained3 ~ t: p8 Y6 l* p1 {
unchanged. Surprisingly, the pubic hair almost com-1 ]0 A7 v2 e4 ^; t) T2 I
pletely disappeared except for a few vellous hairs at2 x0 N, _% {, Z/ F; P
the base of the phallus. Testicular volume was still 2. Q$ I& T& P2 ?. d
mL, and the size of the penis remained unchanged.
. V5 d0 p* d/ d' [6 Y( @/ O, B$ I# QThe mother also said that the boy was no longer hav-% c% M0 w8 {- v8 y8 M$ q8 o% l; G
ing frequent erections.
, A- G! j k$ V$ CBoth parents were again questioned about use of
% e" G1 z: T) O" _3 U" d! nany ointment/creams that they may have applied to+ @& ]" d9 Y8 C" l0 [3 Q
the child’s skin. This time the father admitted the
" b" y" f9 F, z' lTopical Testosterone Exposure / Bhowmick et al 541
0 ]/ J! M$ H' Ruse of testosterone gel twice daily that he was apply-9 j& U. T6 a, t/ u0 x8 ]" b+ r3 N
ing over his own shoulders, chest, and back area for. P( T& w" n" x8 j C9 R8 O( T) r# V0 t
a year. The father also revealed he was embarrassed6 Q; o, q; M2 i6 i6 P+ q
to disclose that he was using a testosterone gel pre-
0 i* R0 W' j) ^scribed by his family physician for decreased libido
( q1 Y% i5 e! m9 z1 S" O8 nsecondary to depression.- X, d2 ^6 O1 b+ R& P( l8 J- J. c3 w
The child slept in the same bed with parents.% R& F1 C7 b& L# U5 s+ m- |, R/ Z5 L
The father would hug the baby and hold him on his
* V$ w& _' p) w# g/ O$ Y) Fchest for a considerable period of time, causing sig-# G2 p/ \: J% y) P; {1 N, K6 f
nificant bare skin contact between baby and father.
: O( ~ b1 k/ _# Q1 y+ ?The father also admitted that after the phone call,
$ j, D' g, G! s8 S. a. P9 Kwhen he learned the testosterone level in the baby
- q$ v- N" x7 q! {was high, he then read the product information
9 t" P! B+ s% D) p% s; c' u" j! epacket and concluded that it was most likely the rea-. N! ^- S5 l! f' l
son for the child’s virilization. At that time, they2 T/ n9 }7 Y! }- x Z
decided to put the baby in a separate bed, and the
7 b5 [+ J' `0 {( X& e" x( Efather was not hugging him with bare skin and had
& X8 _ w6 f' S q* ?been using protective clothing. A repeat testosterone
. M+ `0 A/ W6 j+ \7 r6 Itest was ordered, but the family did not go to the
! `$ Y1 H# X( @: C+ @2 W7 qlaboratory to obtain the test.; h h4 C9 v: ?: s: s) z
Discussion
a) ~; u2 @4 u, aPrecocious puberty in boys is defined as secondary( q' k6 `* l& R; a! O) P: J% M
sexual development before 9 years of age.1,4# Y, S5 O9 p& S% f2 p7 b; @; j3 H
Precocious puberty is termed as central (true) when
. g& f1 e: y# [it is caused by the premature activation of hypo-0 P3 X) s& ?( J6 }7 I3 p
thalamic pituitary gonadal axis. CPP is more com-
2 z2 L+ Y+ q+ n5 {mon in girls than in boys.1,3 Most boys with CPP
+ n0 q: S( s3 Omay have a central nervous system lesion that is
6 a8 Q; \' }0 P/ g% tresponsible for the early activation of the hypothal-$ j8 j* S2 {$ C! {: x, B* e
amic pituitary gonadal axis.1-3 Thus, greater empha-' H- u, }5 T2 n) y
sis has been given to neuroradiologic imaging in
) j- h/ c; q- tboys with precocious puberty. In addition to viril-
: a1 k: y. R+ [) Wization, the clinical hallmark of CPP is the symmet-
9 n# O# z6 G' N4 q1 e9 _$ v6 Jrical testicular growth secondary to stimulation by' ?! Q, \. U$ f& d
gonadotropins.1,3
3 u" v0 ]7 [4 d0 a0 hGonadotropin-independent peripheral preco-
' } a: b6 _ e* U- t wcious puberty in boys also results from inappropriate. x' h. x! |. ~& R* @ o
androgenic stimulation from either endogenous or* \4 [4 y+ }% m0 f4 k% K7 _ Z
exogenous sources, nonpituitary gonadotropin stim-, n& G8 T4 b6 X! N
ulation, and rare activating mutations.3 Virilizing6 G, S, d: q, [" y
congenital adrenal hyperplasia producing excessive
N5 u, Z( p0 }! `adrenal androgens is a common cause of precocious
8 y- A3 R- M$ _; M Tpuberty in boys.3,4. u% x( \: l7 J7 o- B9 y
The most common form of congenital adrenal
0 m: X: {' T+ }hyperplasia is the 21-hydroxylase enzyme deficiency.: B% `, ~; u4 T: b5 a* [3 h
The 11-β hydroxylase deficiency may also result in8 n! i- v6 j* t$ U) m
excessive adrenal androgen production, and rarely,
" f+ q" }# u5 y! [9 o, W6 p4 Gan adrenal tumor may also cause adrenal androgen9 a0 I* c0 ]- U- F6 T0 I( N
excess.1,3
. k1 P1 U- o( D* d) N$ E$ zat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
0 i6 B2 r1 E* R# b542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
6 ^$ t/ p3 q3 K) ^7 K4 r+ _A unique entity of male-limited gonadotropin- t& Q$ C# p; c; H7 C
independent precocious puberty, which is also known
1 Z. c1 h. s5 S. A3 k" z0 i v2 [as testotoxicosis, may cause precocious puberty at a* F* l" v3 U- F: W9 h. f. \! u L2 ?
very young age. The physical findings in these boys7 Y' _6 \7 [: |5 O& P4 Z
with this disorder are full pubertal development,
X2 E% Z5 ]5 Tincluding bilateral testicular growth, similar to boys' X# e T% M' b2 G9 j
with CPP. The gonadotropin levels in this disorder; f6 I8 l/ @- k6 c, t
are suppressed to prepubertal levels and do not show
4 @1 z+ J& X; I3 R7 C* F) zpubertal response of gonadotropin after gonadotropin-& F9 p, H0 c' S9 k3 K2 B* S
releasing hormone stimulation. This is a sex-linked1 H- D4 {7 G( h; g$ E
autosomal dominant disorder that affects only* B/ z1 u0 e3 \# v2 |
males; therefore, other male members of the family
4 y6 W- O! }; s4 P( y* X5 |may have similar precocious puberty.3 A9 D1 f' R: n8 N* a: d0 ^6 ^
In our patient, physical examination was incon-
& W. X0 H E3 k; O% o4 p, Hsistent with true precocious puberty since his testi-- h/ z. f9 d" M& l
cles were prepubertal in size. However, testotoxicosis
$ D0 K( a5 i% V# n+ M) k1 `) Owas in the differential diagnosis because his father; S E& f5 Y: o
started puberty somewhat early, and occasionally,
! t8 U+ _( x' N9 i8 ~, \testicular enlargement is not that evident in the) X5 E) I0 t7 c; P7 n
beginning of this process.1 In the absence of a neg-
- X+ e4 v! a& F+ ]4 A: A" [ative initial history of androgen exposure, our0 b$ h% k& x3 R- }+ a
biggest concern was virilizing adrenal hyperplasia,; R/ a% P4 B1 b) W' Y
either 21-hydroxylase deficiency or 11-β hydroxylase
- H: ? [5 |0 s* r1 a0 Gdeficiency. Those diagnoses were excluded by find-1 \* v1 L8 M4 R, B) G7 r
ing the normal level of adrenal steroids.- [ |3 \4 g8 L6 G9 b, B- N' {; v
The diagnosis of exogenous androgens was strongly% M1 r3 e4 S$ E
suspected in a follow-up visit after 4 months because
4 H \8 F4 D& {$ V. r) f% u8 }) gthe physical examination revealed the complete disap-+ W$ S" I- e# Z) h4 o
pearance of pubic hair, normal growth velocity, and A, Y. }; `/ `) f3 u3 d- j
decreased erections. The father admitted using a testos-* J" {/ t8 C( f' J9 V
terone gel, which he concealed at first visit. He was/ N y* A( n3 u7 H+ C. i
using it rather frequently, twice a day. The Physicians’- Z' V$ I( Y2 w, i7 d0 d
Desk Reference, or package insert of this product, gel or
+ u0 F& ~ q: l( n1 ]% ocream, cautions about dermal testosterone transfer to
: h" F' o( R- `; a+ ^& gunprotected females through direct skin exposure.* ]) u0 r8 P" c0 p, w2 S% s
Serum testosterone level was found to be 2 times the
4 |: D9 s; O x9 [. J. q! sbaseline value in those females who were exposed to
# }0 ?" c, O4 xeven 15 minutes of direct skin contact with their male
. l' X8 a3 V9 Cpartners.6 However, when a shirt covered the applica-
, G W: \7 M6 B gtion site, this testosterone transfer was prevented.2 B3 L# x% [% o0 f$ a: I' g
Our patient’s testosterone level was 60 ng/mL,
9 [2 M( Y/ r$ nwhich was clearly high. Some studies suggest that3 E5 f# W( s6 w( O3 F
dermal conversion of testosterone to dihydrotestos-
; ?1 |; n4 `* \3 m# m$ C; q kterone, which is a more potent metabolite, is more
+ h9 o( O) y' ^& factive in young children exposed to testosterone
9 L8 G+ u7 H# I- r% m; Mexogenously7; however, we did not measure a dihy-6 q5 ^7 {" ^! j, x" h$ P
drotestosterone level in our patient. In addition to
4 l3 C9 d8 }; N! X: cvirilization, exposure to exogenous testosterone in
& u% J2 \" e- Z9 b2 g9 `9 m$ Ychildren results in an increase in growth velocity and
( O6 ?# ]! P! i) sadvanced bone age, as seen in our patient.
( A7 F. z5 r* PThe long-term effect of androgen exposure during" n' O4 u u0 s- Q# ?# e \
early childhood on pubertal development and final% t0 a8 \4 [: j/ n/ F4 i9 a9 Y
adult height are not fully known and always remain
$ M+ e" z/ ]. y1 ^a concern. Children treated with short-term testos-
& K) E5 T5 ~* i' B! cterone injection or topical androgen may exhibit some
) T; y+ g' e6 N1 x1 x5 w' Oacceleration of the skeletal maturation; however, after
! `+ i! O. O+ X9 f5 E* L/ _cessation of treatment, the rate of bone maturation" |0 v) N8 j2 D/ k4 o
decelerates and gradually returns to normal.8,9) `" c. F" `: W
There are conflicting reports and controversy. q' c1 m6 I( q5 f9 j! Z9 |
over the effect of early androgen exposure on adult$ h+ q. A0 @, P( Z& B& L
penile length.10,11 Some reports suggest subnormal
0 h# H/ v" z6 ?, Oadult penile length, apparently because of downreg-/ b' e. P: |% G+ [4 n1 m
ulation of androgen receptor number.10,12 However,
9 E$ s3 X. }" r7 h7 z+ w2 RSutherland et al13 did not find a correlation between
) X" X. @2 G! N, ~7 L U7 lchildhood testosterone exposure and reduced adult( ~5 x5 A3 P8 x& y9 Q1 O" ], x2 w4 y# { y
penile length in clinical studies. L& A. f V! ~6 Y: G
Nonetheless, we do not believe our patient is4 t/ s, _% b0 r7 N
going to experience any of the untoward effects from4 |: a8 J; P6 l0 u* }! q4 \
testosterone exposure as mentioned earlier because
0 u6 E; M0 a% I" R2 x0 kthe exposure was not for a prolonged period of time.2 K% ?5 l) N% i6 Z" ^& o
Although the bone age was advanced at the time of
h% i4 m( u' n* cdiagnosis, the child had a normal growth velocity at
9 d9 O! l1 r- I- X) t$ ?the follow-up visit. It is hoped that his final adult/ P# P4 O, M4 }
height will not be affected.+ [. J$ u3 Q# W! v% Y( ]8 K2 L
Although rarely reported, the widespread avail-
! G( R( B8 ]" l5 A" j$ cability of androgen products in our society may# E+ ?- n: h+ x& o! a% C
indeed cause more virilization in male or female9 ^; f% D- j6 q& U
children than one would realize. Exposure to andro-
" a& z8 N. O* @# O+ d2 E7 P9 hgen products must be considered and specific ques-
; A2 T. e; |* |" Itioning about the use of a testosterone product or/ s7 \7 Q. E# {: \' K% E: R# b
gel should be asked of the family members during" ]. w. r( A# m$ r
the evaluation of any children who present with vir-/ ?& ^5 G+ l/ P7 S( l# ^9 D$ V
ilization or peripheral precocious puberty. The diag-8 x# H- j+ z! _! d
nosis can be established by just a few tests and by$ Q7 k y. W; w& M
appropriate history. The inability to obtain such a
" }* d |2 L9 Y) S) H$ D* \) U+ rhistory, or failure to ask the specific questions, may D' Z) f& O# z7 o* h: |
result in extensive, unnecessary, and expensive0 O( o/ l. E' v* ~3 Y* M7 J6 L r1 @
investigation. The primary care physician should be1 e2 _6 l) T+ } W1 t7 o
aware of this fact, because most of these children, w% x0 G7 g* w* W
may initially present in their practice. The Physicians’
+ _4 W: o7 H/ R6 A# }Desk Reference and package insert should also put a. T# @- ^ s. S: N/ D: l+ }
warning about the virilizing effect on a male or
5 y& D) }, `. y: P9 N6 q( Ofemale child who might come in contact with some-
0 z6 \; u; b7 I e- }3 None using any of these products.
! z! T% d* l2 ^7 AReferences3 j8 t* \, g g% R6 o% u" e# [9 h
1. Styne DM. The testes: disorder of sexual differentiation
( @; S! y* ]9 J% F. F* Mand puberty in the male. In: Sperling MA, ed. Pediatric
$ x5 L8 O1 u6 A& { L+ D- {Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
4 _2 b# t4 V* x# O" \; ? \2002: 565-628. g, @# X1 R+ ?$ R( p
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious G8 ]9 s, ^ e* x. p
puberty in children with tumours of the suprasellar pineal* U: d# B \7 [# s8 O* _8 w
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
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3 i- g* R1 S* O, `areas: organic central precocious puberty. Acta Paediatr.
& ?9 \5 e# O$ g2001;90:751-756.
: K8 j! r* @3 k2 f+ w3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed.
; a# C! J/ y% @9 { d. B1 L, LPediatric Endocrinology. 4th ed. New York, NY: Marcel6 W* S2 v7 L; x, {* K
Dekker Inc; 2003:211-238.
8 c2 N( k3 q9 t# Z* J4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual4 q2 e* n& }. v6 y c. P
development in a two-year-old boy induced by topical
; Q( |& A7 @+ Cexposure to testosterone. Pediatrics. 1999;104:e23.
6 w% D8 f' f. _" s, \" d1 g5. Greulich WW, Pyle SI, eds. Radiographic Atlas of" ^0 F' D b _1 N* W: Z
Skeletal Development of the Hand and Wrist. 2nd ed.
8 x" T' U0 y) o& Q% I( V! qStanford, CA: Stanford University Press; 1959.
+ y2 N, h) _% v$ t6. Physicians’ Desk Reference. Androgel 1% testosterone,* j- n' C6 W* D
Unimed Pharmaceutical Inc. Montvale, NJ: Medical
7 y% _1 t1 l8 `3 N3 }7 cEconomics Company, Inc; 2004:3239-3241.
% J* w+ P) r/ X7. Klugo RC, Cerny JC. Response of micropenis to topical6 i; j3 l0 t a Y$ d1 F( j
testosterone and gonadotropin. J Urol. 1978;119:+ L* c; ]& ]7 N; X8 o% Z
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