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is a significant concern for physicians. Central
- z' ~; B3 k5 H0 D; i2 J( q |precocious puberty (CPP), which is mediated! B+ }+ |' i9 q; L I
through the hypothalamic pituitary gonadal axis, has
7 u& {' F7 E. Z5 J0 ^3 Ia higher incidence of organic central nervous system0 @! n! }, I- Y- J
lesions in boys.1,2 Virilization in boys, as manifested
" u6 F' V+ p) E) `# `/ \" [! w3 l/ O5 v5 oby enlargement of the penis, development of pubic
6 x) Q, O7 \: d4 w! Lhair, and facial acne without enlargement of testi-- G/ E! x" E( Z/ v6 a
cles, suggests peripheral or pseudopuberty.1-3 We5 @9 }+ J/ O. P0 f
report a 16-month-old boy who presented with the5 i9 t9 [' v l" o0 \6 L3 L4 r
enlargement of the phallus and pubic hair develop-
! } x* _1 P9 {: x( X3 n6 jment without testicular enlargement, which was due: w: d( M' ^% E7 M7 l
to the unintentional exposure to androgen gel used by
7 }) b" f5 D/ rthe father. The family initially concealed this infor-1 h9 J% T9 z6 c9 x) X* u" o
mation, resulting in an extensive work-up for this
0 j7 \# V. L# o7 Qchild. Given the widespread and easy availability of
1 u4 s- e, U* z. x# ltestosterone gel and cream, we believe this is proba-
6 o1 a; ]/ v5 z1 Sbly more common than the rare case report in the3 w5 g8 a( @ v
literature.4/ \9 M5 d+ T" R0 y6 v6 Z# f$ X
Patient Report- Q/ i) X. c- r( m
A 16-month-old white child was referred to the
7 E7 d' ~& D1 Y: J5 j$ Jendocrine clinic by his pediatrician with the concern
) g6 E; x9 M& b6 M/ Qof early sexual development. His mother noticed
6 Y7 A3 \- P" @7 B+ dlight colored pubic hair development when he was+ ^" [. m, D) V8 ~1 `1 {4 }9 x
From the 1Division of Pediatric Endocrinology, 2University of
$ B) O0 E' g0 K+ iSouth Alabama Medical Center, Mobile, Alabama.
9 D. k; [ X* x2 j3 \Address correspondence to: Samar K. Bhowmick, MD, FACE,
' U F# e* ~, w& N+ P7 LProfessor of Pediatrics, University of South Alabama, College of
, H# p" g: l# y+ CMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
5 a2 r* j3 x; @( T/ Ge-mail: [email protected].
# ]# U+ G" x# }; }; [! ~* mabout 6 to 7 months old, which progressively became
% }6 t# t$ v4 I+ W! I) f# P7 B4 zdarker. She was also concerned about the enlarge-/ @" n6 f) ~7 r. G5 ~& O
ment of his penis and frequent erections. The child
( L1 T& A* D8 ^# }was the product of a full-term normal delivery, with
' a% v9 o- _0 Ka birth weight of 7 lb 14 oz, and birth length of8 ^& v/ A7 o" G3 z
20 inches. He was breast-fed throughout the first year% w6 V# L- Q$ F8 M# w2 ?4 J
of life and was still receiving breast milk along with' S0 b; H# Y+ V1 r6 ], y
solid food. He had no hospitalizations or surgery,
% u& j8 h B) u3 I8 W5 U& }and his psychosocial and psychomotor development
" h7 n3 W! G$ i3 ^; {was age appropriate.
! @5 c. w; ~1 D1 W( Q G6 VThe family history was remarkable for the father,
3 A/ t( p/ J# W s( rwho was diagnosed with hypothyroidism at age 16,
* p4 u8 ?& X6 w! E0 a+ pwhich was treated with thyroxine. The father’s
+ q# I! n: D! ~4 vheight was 6 feet, and he went through a somewhat0 d# h! Z# k9 w3 H* Y) E. B
early puberty and had stopped growing by age 14.' d, I, G! ?. ^. K: e
The father denied taking any other medication. The- U' @6 W. r9 A! d) I2 P
child’s mother was in good health. Her menarche
1 p6 a. Z. _* s/ p3 s2 V& b1 Cwas at 11 years of age, and her height was at 5 feet
( ^" |1 F2 t1 n& C5 inches. There was no other family history of pre-' r" r' g* L2 G; ^0 l; l* m
cocious sexual development in the first-degree rela-
; y4 Z) ?: ]6 }" F: N6 j$ y wtives. There were no siblings. A3 I* w6 ]- _9 m1 k- z6 X3 U6 @
Physical Examination
" j8 y: [* X- _ R. j9 P2 I; hThe physical examination revealed a very active,! r! f) J2 j& |1 D7 `7 b
playful, and healthy boy. The vital signs documented+ C6 ^2 A/ X* X0 j" ^
a blood pressure of 85/50 mm Hg, his length was r5 H+ O9 M# |% |
90 cm (>97th percentile), and his weight was 14.4 kg
6 ?0 {" L' q2 P(also >97th percentile). The observed yearly growth
4 n4 w; u! ^: yvelocity was 30 cm (12 inches). The examination of+ b1 o* D$ N% ~% ^# b7 g, U
the neck revealed no thyroid enlargement.) E5 S8 d; _4 y
The genitourinary examination was remarkable for. J9 p: K0 G q; p* _
enlargement of the penis, with a stretched length of
- K$ U$ E) h' z3 @2 @& w# t8 cm and a width of 2 cm. The glans penis was very well7 [4 |8 C; l J0 s
developed. The pubic hair was Tanner II, mostly around
+ ?! u; I' m' p/ l- O5402 b! [3 y) h- F+ m
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from P* _+ U' q9 `& p. n: B% T( O
the base of the phallus and was dark and curled. The
* a: ~4 j8 A' f% Ztesticular volume was prepubertal at 2 mL each.
+ [! x# I4 @; Q4 N- FThe skin was moist and smooth and somewhat
3 ]" f& J* A( k: q8 S/ t4 `% `oily. No axillary hair was noted. There were no9 ]) f6 G$ g' d5 U. [# j
abnormal skin pigmentations or café-au-lait spots.
. g0 I0 W$ S" e1 k0 p. q1 `Neurologic evaluation showed deep tendon reflex 2+
' Q Z0 o. @8 ebilateral and symmetrical. There was no suggestion0 n% \3 @/ u- R6 O
of papilledema.
% a" o9 Y( x" Z4 c" H( ULaboratory Evaluation1 F* M: S/ x8 T! m, ]1 g
The bone age was consistent with 28 months by
" G7 {0 d9 V+ qusing the standard of Greulich and Pyle at a chrono-: h: _8 n' m) |5 z; `7 w
logic age of 16 months (advanced).5 Chromosomal! |: q. ]/ [ J p( l+ j
karyotype was 46XY. The thyroid function test
9 w' p: r0 o: Q/ `showed a free T4 of 1.69 ng/dL, and thyroid stimu-1 o( d. {% Y0 D( ?4 g8 {8 L
lating hormone level was 1.3 µIU/mL (both normal).4 q( c1 |8 b1 t; I
The concentrations of serum electrolytes, blood$ f) [5 y9 J4 l) x& B( g
urea nitrogen, creatinine, and calcium all were
" J; P9 K1 P3 g+ `7 y% R$ ewithin normal range for his age. The concentration i5 o" Y& ?8 H1 i( K, s$ d, V- |
of serum 17-hydroxyprogesterone was 16 ng/dL+ h& q* m- A# l! E( ^8 w) u2 I
(normal, 3 to 90 ng/dL), androstenedione was 201 y$ ]0 b+ G9 a6 u$ T9 r6 Q& p
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-) ~/ E Y: |6 O _
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
- g- A! f$ R$ b/ e1 B8 d- b1 h3 b3 Cdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
3 `4 s& Z) t, ~" y/ y0 E49ng/dL), 11-desoxycortisol (specific compound S)& ]5 m/ t, ~$ L- B" D4 R/ T( Y$ W
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-) O6 W2 T# Y1 {1 {
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
6 e8 s2 X6 L7 N+ D7 c \testosterone was 60 ng/dL (normal <3 to 10 ng/dL)," j7 }% S+ E- j* ^
and β-human chorionic gonadotropin was less than+ B' T7 l% z# b a# K0 R
5 mIU/mL (normal <5 mIU/mL). Serum follicular
$ f' e- j' l. vstimulating hormone and leuteinizing hormone* Y( m$ ]4 M: L Q, D4 R
concentrations were less than 0.05 mIU/mL
4 L6 }1 M3 L! ?8 C(prepubertal).
, a0 c/ ~+ k1 ?: w4 vThe parents were notified about the laboratory
5 J d' \$ w* t1 w1 Fresults and were informed that all of the tests were# n1 N+ b" G" l; Y) j( ~
normal except the testosterone level was high. The: q& O2 T1 G$ M _" q1 i
follow-up visit was arranged within a few weeks to( `/ q9 K3 m4 T& E. M6 {( G2 \
obtain testicular and abdominal sonograms; how-
+ A# _2 J( m7 y2 Vever, the family did not return for 4 months.
9 \- w$ W: N* R% i( j4 F' b5 SPhysical examination at this time revealed that the+ U) {/ j' r1 F% H
child had grown 2.5 cm in 4 months and had gained
9 A; X' A3 Q& T) ?2 kg of weight. Physical examination remained
% R$ G0 F/ m, T& [6 f( ~7 xunchanged. Surprisingly, the pubic hair almost com-
8 ~; n* W' a. kpletely disappeared except for a few vellous hairs at
# {7 D& x& E j7 D6 P) b; Z3 ] Pthe base of the phallus. Testicular volume was still 2
' X% @8 n, w: Z" F" Y+ B3 P; qmL, and the size of the penis remained unchanged.
' L! {5 \7 @# m6 o( O$ S% n, }6 P/ OThe mother also said that the boy was no longer hav-" Q: h0 w$ g% R' r2 v) k
ing frequent erections.
1 B% I [) T3 q: hBoth parents were again questioned about use of
% @" e/ ^6 A8 K% _& dany ointment/creams that they may have applied to- `% Z+ }# H/ P$ d. r4 x- X8 r
the child’s skin. This time the father admitted the2 Q# ?7 ?3 W/ F% j
Topical Testosterone Exposure / Bhowmick et al 541) a1 l+ A `6 U8 q1 I" n
use of testosterone gel twice daily that he was apply-
1 x" K2 u" F! S4 g8 _$ H7 c: e3 Qing over his own shoulders, chest, and back area for8 l# H+ O5 e F; }
a year. The father also revealed he was embarrassed
% s+ y3 l; v/ S5 Jto disclose that he was using a testosterone gel pre-
+ u6 Y6 j H! r4 Iscribed by his family physician for decreased libido' n. E& {& [% H
secondary to depression.
( X+ r. W. f, H vThe child slept in the same bed with parents.
4 H5 x& j4 G; r3 H/ NThe father would hug the baby and hold him on his0 w; h& |" ~; S/ @
chest for a considerable period of time, causing sig-- o& d: @! d* l9 { e1 q3 |* _
nificant bare skin contact between baby and father." x% {6 H9 c+ f8 o8 t
The father also admitted that after the phone call,
$ q( ^0 Z. j2 vwhen he learned the testosterone level in the baby9 t, Z. B1 M; r0 y' r
was high, he then read the product information8 n3 ? @( q/ l
packet and concluded that it was most likely the rea-# s7 x: L- i9 ?2 r& b( n0 `6 D
son for the child’s virilization. At that time, they
9 ]" `* ?* y( N0 W% cdecided to put the baby in a separate bed, and the* h6 a+ o5 A" a" B
father was not hugging him with bare skin and had
7 t7 Y/ [( o' Xbeen using protective clothing. A repeat testosterone7 w8 A. i9 k+ [: Z7 [. E
test was ordered, but the family did not go to the. g) k: i* J- J$ j' W1 i) k
laboratory to obtain the test.
6 M6 }8 N/ m1 g( N; l4 lDiscussion
; D0 J3 x& Y) V, v+ ?- oPrecocious puberty in boys is defined as secondary
& T1 D/ K; j' F- E/ _3 Isexual development before 9 years of age.1,4
K) u5 |* k7 xPrecocious puberty is termed as central (true) when N0 P: ~5 g4 J8 g! Z4 D
it is caused by the premature activation of hypo-6 }$ T K+ [- Q1 E- M% q6 f
thalamic pituitary gonadal axis. CPP is more com-
, S2 S' q& m8 v2 G' {* Cmon in girls than in boys.1,3 Most boys with CPP* T( h" _- p% k' ]* \
may have a central nervous system lesion that is
; o' L2 T! _/ |8 O; p( rresponsible for the early activation of the hypothal-
3 [$ X1 z& U% f: N, Uamic pituitary gonadal axis.1-3 Thus, greater empha-
- o7 D8 |" a& l. M% c3 Psis has been given to neuroradiologic imaging in
6 V6 |3 ~$ u& A9 wboys with precocious puberty. In addition to viril-8 _6 K% _3 J/ I1 T; V" o+ z5 a6 X+ `
ization, the clinical hallmark of CPP is the symmet-" s2 `( ^" u2 D3 {
rical testicular growth secondary to stimulation by% T* M& @6 x$ U
gonadotropins.1,3
* n4 x1 h2 I3 U$ v7 SGonadotropin-independent peripheral preco-
" K- X3 w. v9 ?5 s; Q8 ?4 icious puberty in boys also results from inappropriate
- F6 d1 q, V' W& J4 r; Aandrogenic stimulation from either endogenous or, E# W" f Q" L
exogenous sources, nonpituitary gonadotropin stim-
( N- E- H# q+ r& q3 qulation, and rare activating mutations.3 Virilizing
' I& B* `* K. y6 e) [congenital adrenal hyperplasia producing excessive
" E) h# t! k# ]' l$ wadrenal androgens is a common cause of precocious
' S$ U$ N- N6 rpuberty in boys.3,49 K& I7 \ Z4 K% ?- L
The most common form of congenital adrenal
- W& w) U: v9 ?% phyperplasia is the 21-hydroxylase enzyme deficiency.
" \5 x! D) {' I# K" a5 [2 ~The 11-β hydroxylase deficiency may also result in
3 Z a3 c. W: i/ \+ d# jexcessive adrenal androgen production, and rarely,
! V( K3 P$ e' k2 L5 x) Han adrenal tumor may also cause adrenal androgen
" f5 }5 s+ Q# T4 Uexcess.1,3
" W( L$ i5 C" P$ Nat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from5 J' q) \8 F& W3 M/ R
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
( Q/ J; [* V. x6 C" S6 y% oA unique entity of male-limited gonadotropin-
8 L9 S" _) w1 {1 vindependent precocious puberty, which is also known
) X, |" [; P+ w/ K- c$ \* Kas testotoxicosis, may cause precocious puberty at a
+ B* {! l& X, Q3 u/ Z0 e8 ?. H' Kvery young age. The physical findings in these boys) ^5 c3 e3 z8 Y5 W7 G$ h# C; D7 N
with this disorder are full pubertal development,
# K2 m* I1 J8 J+ S) T! k; {5 wincluding bilateral testicular growth, similar to boys
# c4 d; G$ {: E: R1 v7 I! {: Ewith CPP. The gonadotropin levels in this disorder
" w3 R9 g; Z0 jare suppressed to prepubertal levels and do not show
% x5 e- q; V4 K' Q3 fpubertal response of gonadotropin after gonadotropin-
6 o& t5 ?2 v4 ~2 i' Wreleasing hormone stimulation. This is a sex-linked
2 G! v9 t/ X: nautosomal dominant disorder that affects only& U3 @3 z- p/ L2 D2 R3 }
males; therefore, other male members of the family# ~" {7 R7 a5 l! j' @1 f9 g
may have similar precocious puberty.32 C. ?! B) T. W$ U) x7 _8 |; s
In our patient, physical examination was incon-
6 x! |$ ~; [: A ~. G2 J. {, usistent with true precocious puberty since his testi-
2 v% k# J" J4 U+ E" Z2 ?* }- w5 F2 icles were prepubertal in size. However, testotoxicosis
* x ^! Q& m4 h2 D) Twas in the differential diagnosis because his father! k3 g2 N6 J1 M& _) [) x
started puberty somewhat early, and occasionally,
* ~# B& o; O: a) jtesticular enlargement is not that evident in the* R' A! G" |; F& e
beginning of this process.1 In the absence of a neg-6 Z$ O. N) V$ U& M% t* m' K# t6 @
ative initial history of androgen exposure, our
8 f) X% e& C0 f+ @* S% }* K2 Q0 kbiggest concern was virilizing adrenal hyperplasia,
5 [" b4 r2 C* Yeither 21-hydroxylase deficiency or 11-β hydroxylase8 A& a* t) ~& H; l9 _4 v( m
deficiency. Those diagnoses were excluded by find-1 R; ]" ^) d, K! k/ J
ing the normal level of adrenal steroids.
# g! d' Y& d5 o( KThe diagnosis of exogenous androgens was strongly1 |) q2 Z$ v+ x6 v( H$ W
suspected in a follow-up visit after 4 months because
: {9 o7 s* F) Q) ?# Qthe physical examination revealed the complete disap-
! f) z; j" r3 b2 p" y( zpearance of pubic hair, normal growth velocity, and
& L! E- I& @; D+ c ?5 }$ L1 wdecreased erections. The father admitted using a testos-3 o: c) I: I8 ~9 j
terone gel, which he concealed at first visit. He was
% d9 D$ ]1 r& [- T+ ]using it rather frequently, twice a day. The Physicians’
: C: q* k) L( uDesk Reference, or package insert of this product, gel or6 W' x) Z( X, {9 ]
cream, cautions about dermal testosterone transfer to
2 v! R7 R" J; vunprotected females through direct skin exposure.- K" |' t Z: p- d4 H' m7 e8 F, K6 w# ^
Serum testosterone level was found to be 2 times the% u g, V* ~- \6 ]( i9 s
baseline value in those females who were exposed to
& f* ~ X: Y5 f, J/ O. C# Leven 15 minutes of direct skin contact with their male
/ K5 v" X# V; V- h$ rpartners.6 However, when a shirt covered the applica-: }* A+ S0 a7 x5 ]: h. |. I
tion site, this testosterone transfer was prevented.
& U" Q7 k& }0 j5 U: ?Our patient’s testosterone level was 60 ng/mL,
4 H8 ?6 m. \8 p" o3 E" xwhich was clearly high. Some studies suggest that
5 x4 K! J4 Y# Xdermal conversion of testosterone to dihydrotestos-5 W+ r( E/ b9 D4 z; I$ q* c
terone, which is a more potent metabolite, is more
& s d& w+ h. H) \1 Aactive in young children exposed to testosterone4 U7 f. |/ t. b
exogenously7; however, we did not measure a dihy-# A/ {% n. z% o8 O7 z% E9 s
drotestosterone level in our patient. In addition to P! l3 E9 ]* J" C/ I! _
virilization, exposure to exogenous testosterone in7 v4 S' \4 m" f3 {; B2 h* |1 M/ h
children results in an increase in growth velocity and7 u; o& A" V% K" d6 _ n
advanced bone age, as seen in our patient.
5 z% q1 z( L( O- O8 vThe long-term effect of androgen exposure during ~! f; P" r4 q' i9 m
early childhood on pubertal development and final
2 `& X. r# z( a5 D6 p- L Eadult height are not fully known and always remain. @9 w4 ?1 \4 B9 T) A
a concern. Children treated with short-term testos-+ T( @. u1 k( q0 D3 f& F4 b
terone injection or topical androgen may exhibit some5 |3 o! {( P( D
acceleration of the skeletal maturation; however, after
8 r8 U: ^+ v) Y2 y: A+ B* [cessation of treatment, the rate of bone maturation
! }- ?4 |* c7 n idecelerates and gradually returns to normal.8,9) `' e% j7 K$ G5 l! e
There are conflicting reports and controversy
. x/ `6 V L& i5 e ~( mover the effect of early androgen exposure on adult" k' u6 [& R# s. u0 K& U
penile length.10,11 Some reports suggest subnormal2 z9 ?$ W: Y. o7 |
adult penile length, apparently because of downreg-
* z, \* W% M0 H( \! [4 Bulation of androgen receptor number.10,12 However,7 X [7 W) ?/ ~4 Y# m8 w( k5 u
Sutherland et al13 did not find a correlation between; R% J, N$ w6 H7 i
childhood testosterone exposure and reduced adult2 U" p0 s) ]( E
penile length in clinical studies.
2 B: U+ k6 I9 ]9 E* l: LNonetheless, we do not believe our patient is
* C. v" z/ j2 z" M! W$ `) Z8 y6 bgoing to experience any of the untoward effects from
( a7 W' |* h [4 m% J* A7 ttestosterone exposure as mentioned earlier because" t! K1 z* i$ u' x: b! c8 J
the exposure was not for a prolonged period of time.
9 Q$ x' {' b" v/ t7 DAlthough the bone age was advanced at the time of* _ H( ?2 i; [0 Z: F% t9 m4 f; S
diagnosis, the child had a normal growth velocity at; ?0 e, j ]8 _/ r2 _% g( E
the follow-up visit. It is hoped that his final adult2 U) n1 P2 ?6 ?" y6 {( {
height will not be affected.
$ M" h( H8 u. }# D( lAlthough rarely reported, the widespread avail-# q# s8 i6 R7 e0 D" ?1 L, w* y
ability of androgen products in our society may. r, W, F/ W7 H
indeed cause more virilization in male or female
: \' n+ X- x* N1 U2 e5 o5 jchildren than one would realize. Exposure to andro-. t1 a1 [! ]4 c( t" `
gen products must be considered and specific ques-
& }! Z" ^. N& [+ Ttioning about the use of a testosterone product or
: Z7 r/ i2 l$ j& U( Xgel should be asked of the family members during* f' c1 }* C! p- ~. L
the evaluation of any children who present with vir-0 @7 ?9 m- h8 ^8 y
ilization or peripheral precocious puberty. The diag-# ~7 Q: I z# x, K& m, w. Q/ B) {
nosis can be established by just a few tests and by
) S! v, ^ l3 W( S# d4 e) jappropriate history. The inability to obtain such a
* A, K' B8 Y( }4 Y( L: ~ C2 g# [history, or failure to ask the specific questions, may6 {( }9 \+ K+ u+ a. @0 m
result in extensive, unnecessary, and expensive4 Z# B! |# |% m& j- ~7 ?* C% Z
investigation. The primary care physician should be4 k- N- P* n3 a- _: f- ?8 `. E5 ]
aware of this fact, because most of these children3 j) x6 e" U; {
may initially present in their practice. The Physicians’$ Z2 Y% r! M3 L" a& ~
Desk Reference and package insert should also put a
U3 M- D: d* R" Y2 H G; xwarning about the virilizing effect on a male or
# ?+ H) [$ D6 Z8 J8 m) \) c# cfemale child who might come in contact with some-
; _6 T2 T$ j& u9 \3 |4 ione using any of these products.& J! `. H0 J8 H& P
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& \% M! P+ N; u, j8 N4 t# Q2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
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3 z) p8 a7 r/ Xat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from$ C" s/ G/ h% Y
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7. Klugo RC, Cerny JC. Response of micropenis to topical
* h$ J2 L. ^* Q8 L5 Ltestosterone and gonadotropin. J Urol. 1978;119:
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) }' V) Z3 e7 T) |& Y3 M8. Guthrie RD, Smith DW, Graham CB. Testosterone
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