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is a significant concern for physicians. Central3 I" }, o9 B8 i
precocious puberty (CPP), which is mediated& ~, t. [' V4 u2 @
through the hypothalamic pituitary gonadal axis, has
; x* e) M1 j+ |) ea higher incidence of organic central nervous system
7 s; y: o3 r: B0 R, \lesions in boys.1,2 Virilization in boys, as manifested5 P" G: g) R- V: z* N
by enlargement of the penis, development of pubic- C3 y( {4 l+ }' ]- N0 O% W
hair, and facial acne without enlargement of testi-
?3 o9 X# i5 f( jcles, suggests peripheral or pseudopuberty.1-3 We
+ t8 V* u8 R2 O: w! Y0 Q; t! Qreport a 16-month-old boy who presented with the
0 K/ d9 ^7 x' Y6 p$ [% A9 T5 Benlargement of the phallus and pubic hair develop-
7 E2 p4 R7 D: m* @7 yment without testicular enlargement, which was due" t* L4 g, W8 J, o+ N3 v+ u/ _' B
to the unintentional exposure to androgen gel used by
9 J) G" k; V/ ]8 M7 U' N8 N- ythe father. The family initially concealed this infor-
6 `% ~5 \4 o, Q- S B2 tmation, resulting in an extensive work-up for this
. T' B1 J8 _0 z+ s" Echild. Given the widespread and easy availability of
1 h# |+ P" q y( stestosterone gel and cream, we believe this is proba-
* |: z; B! L; a6 u* Ubly more common than the rare case report in the
0 X. ?; M; m8 p2 ?literature.4; q3 l! k! h5 x6 H- ^% A; ?# P7 d
Patient Report4 ~& }5 ^. K* Q8 f& I7 z) q7 C
A 16-month-old white child was referred to the9 a$ P' X( O+ f) k2 D1 o& J# L+ f
endocrine clinic by his pediatrician with the concern
* c- g$ |% R: @- {2 U& [of early sexual development. His mother noticed
+ Y$ m5 b, z' K0 A( q/ Wlight colored pubic hair development when he was
+ g( g0 B0 r' C; q+ [7 L; fFrom the 1Division of Pediatric Endocrinology, 2University of |3 A/ b4 N0 @2 t0 b3 G% S' ~ u
South Alabama Medical Center, Mobile, Alabama.
: m o7 I* F3 \* n1 \) UAddress correspondence to: Samar K. Bhowmick, MD, FACE,
% m0 n2 ?5 v4 P2 m# |* j5 MProfessor of Pediatrics, University of South Alabama, College of
$ [ N6 q1 s8 q, V) c. FMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
7 ~8 h9 r+ U2 ~& De-mail: [email protected].7 I0 ?) X% q2 e# V, g; x% [5 U
about 6 to 7 months old, which progressively became
8 G' ^9 P0 O1 Pdarker. She was also concerned about the enlarge-
( d! T% x: y8 v. f. p( w; g3 u3 mment of his penis and frequent erections. The child: O# U8 o- M5 I) {: e- p# H0 \. J
was the product of a full-term normal delivery, with
2 P3 o( E8 k* Q+ D$ I! a* _: U+ I& J6 K' ba birth weight of 7 lb 14 oz, and birth length of" r( X. ~0 a3 R/ v. w/ A
20 inches. He was breast-fed throughout the first year O# Y! I. T% O; i$ \" e0 F( ?
of life and was still receiving breast milk along with
( D$ c/ C; @5 ?5 J, B. s5 nsolid food. He had no hospitalizations or surgery,
, h! g' f4 K; Z ]$ M( ?and his psychosocial and psychomotor development
9 C t5 P: k" |* b' B2 d1 D2 Wwas age appropriate.* Y* b; U+ M* T2 b! v; t1 u, d
The family history was remarkable for the father,
- g8 _4 l' C# y, W% r& m9 F1 P8 Uwho was diagnosed with hypothyroidism at age 16,$ M" m G. G: g0 ?4 U g: A/ X
which was treated with thyroxine. The father’s) p! F$ R% b6 i# [# y
height was 6 feet, and he went through a somewhat
9 g6 Z, ~& C6 @& U$ kearly puberty and had stopped growing by age 14.1 [' O" a$ I8 \! d0 \
The father denied taking any other medication. The6 K {8 E* R. f6 `5 O+ _
child’s mother was in good health. Her menarche2 n- r4 L6 u3 a8 x" t1 a) o2 ^# P" y
was at 11 years of age, and her height was at 5 feet
# s" |1 i/ U" Z# k, `0 o5 inches. There was no other family history of pre- n* u- W5 m/ F! S2 S
cocious sexual development in the first-degree rela-
8 R p% f' j- _tives. There were no siblings.& O5 n, C6 }$ V8 B* |
Physical Examination H9 N" D9 j) q# C
The physical examination revealed a very active,) E1 r) K. K `6 x7 s
playful, and healthy boy. The vital signs documented) r5 r' `/ v0 N' G+ D5 A( O" P" e
a blood pressure of 85/50 mm Hg, his length was
# i- M% o# U0 [; x# j- X* J90 cm (>97th percentile), and his weight was 14.4 kg
' X, b, I4 i9 z' d; K3 O7 ~+ s(also >97th percentile). The observed yearly growth
; i9 W- i1 s' ~( _2 vvelocity was 30 cm (12 inches). The examination of
0 a/ A+ J# m+ l* Y8 b' Rthe neck revealed no thyroid enlargement.$ L( E2 t2 ?1 Z% Q2 K# O
The genitourinary examination was remarkable for
$ Y' c: g2 z- J* denlargement of the penis, with a stretched length of" j% B( Y1 Q( h6 o3 H( O
8 cm and a width of 2 cm. The glans penis was very well2 ?& [6 c D2 c9 F
developed. The pubic hair was Tanner II, mostly around2 a6 O0 A+ U3 S/ e. j& q* D
540, F; \2 c5 w4 r. l+ q; o- J4 u
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
, `. R, O+ G4 L1 k/ j+ `0 tthe base of the phallus and was dark and curled. The
c) V9 q4 ^& _5 ]testicular volume was prepubertal at 2 mL each.# k+ @$ C2 I( s( L5 n) ]1 P! m2 y* @
The skin was moist and smooth and somewhat W/ \! F. \" e* M
oily. No axillary hair was noted. There were no
5 \" \: q- j- j0 L' wabnormal skin pigmentations or café-au-lait spots.' i, S1 ]6 r \- J' I
Neurologic evaluation showed deep tendon reflex 2+" s+ P( r5 g* A5 L/ H4 }7 u
bilateral and symmetrical. There was no suggestion
& h& h" l3 a- yof papilledema.1 p/ R$ j' c- Q M
Laboratory Evaluation* d$ m% t2 j3 C5 O; s9 k( C( J
The bone age was consistent with 28 months by! D0 H( b+ P/ r0 ~
using the standard of Greulich and Pyle at a chrono-) ~, d) u6 L- q6 A5 w
logic age of 16 months (advanced).5 Chromosomal
0 b' z% P% P: z3 Mkaryotype was 46XY. The thyroid function test
* }' u a) i0 ?% N, Gshowed a free T4 of 1.69 ng/dL, and thyroid stimu-' d/ q" K, x# v
lating hormone level was 1.3 µIU/mL (both normal).
/ Q/ x7 _. V: t& F3 w8 D3 EThe concentrations of serum electrolytes, blood
( ?) |( [8 c/ g) |- g4 Furea nitrogen, creatinine, and calcium all were
( z$ ^2 D/ P( Gwithin normal range for his age. The concentration) f4 [) A7 V7 ^& _8 r) E
of serum 17-hydroxyprogesterone was 16 ng/dL
8 @: L+ q6 F7 }) [) x(normal, 3 to 90 ng/dL), androstenedione was 202 y; I+ B. J# R K! Z
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-! f) ^2 M6 s7 X0 M
terone was 38 ng/dL (normal, 50 to 760 ng/dL),) q2 L% P7 ]8 o
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
% ]' P5 ^+ {0 V' |- \" L49ng/dL), 11-desoxycortisol (specific compound S)
( z8 [0 e8 }3 \' I ^* M% Q6 iwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-1 t5 F6 M3 L" e8 _3 c
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
. H$ v$ ?# \1 ztestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
. E/ _- y# [& B; r* Wand β-human chorionic gonadotropin was less than! E$ Q* c8 f3 S+ k. x( Y! {
5 mIU/mL (normal <5 mIU/mL). Serum follicular
" T( K' W) L5 ?3 n9 H3 R% ~3 tstimulating hormone and leuteinizing hormone
* _* n- i" v6 ?/ ?( ?' |0 Fconcentrations were less than 0.05 mIU/mL
6 ~3 g8 ?% ^4 G; S% P(prepubertal).' h( s$ y, s' g X( E
The parents were notified about the laboratory
! ^. Q7 B0 b8 M- N* M" F1 g% dresults and were informed that all of the tests were0 c( f1 g8 a& L% D+ R! s: p
normal except the testosterone level was high. The. L% z2 C# i# S- ]
follow-up visit was arranged within a few weeks to
, L! k) R/ h' Y7 U7 W% Wobtain testicular and abdominal sonograms; how-
/ N% d/ x* T: E3 z9 _, {ever, the family did not return for 4 months.
' V7 A# m3 ]# B. ^Physical examination at this time revealed that the
4 l- t& i& A! }2 n! x2 Uchild had grown 2.5 cm in 4 months and had gained
. }: x9 A: p! m2 kg of weight. Physical examination remained7 V5 A; `5 q2 o1 }
unchanged. Surprisingly, the pubic hair almost com-
+ l- e8 {' C3 e; m& mpletely disappeared except for a few vellous hairs at* G/ g; x! i: y n) o& v7 c# R
the base of the phallus. Testicular volume was still 28 i7 H- q/ s# V& t5 x/ T
mL, and the size of the penis remained unchanged.2 K7 I4 \# t1 Z6 {: b5 x! N B7 E
The mother also said that the boy was no longer hav-
. U- l8 \9 @! Z( x2 v9 fing frequent erections.! {; \ s1 r4 f6 p
Both parents were again questioned about use of( m; i! C) U# {. K. Z3 M/ O$ v+ n( f
any ointment/creams that they may have applied to7 v, M4 Q- d, z: J) x' F
the child’s skin. This time the father admitted the
7 Q+ M7 s- v- F7 f, iTopical Testosterone Exposure / Bhowmick et al 541
4 z' s; f% m1 A6 Suse of testosterone gel twice daily that he was apply-8 G$ Y& i) O: @* |4 [' h
ing over his own shoulders, chest, and back area for
4 V3 w- a" c) ya year. The father also revealed he was embarrassed
4 s9 u9 f% g: M2 J$ n8 m: K# _to disclose that he was using a testosterone gel pre-9 y( Z6 v- a8 Y
scribed by his family physician for decreased libido
, U% r4 Z$ u. R/ `" S; |secondary to depression.
! L& ~/ N4 ?5 K2 ?7 Y% L+ ]7 N, [9 sThe child slept in the same bed with parents.& e" Y8 ^% k1 x, r
The father would hug the baby and hold him on his
' V5 y, ?6 [# f' m9 _% z8 @chest for a considerable period of time, causing sig-4 Q0 {3 G( n* n6 d% z8 j1 \
nificant bare skin contact between baby and father.
. b: m, R+ J1 d- i- e# @/ ^The father also admitted that after the phone call,( U! E7 v, `1 E
when he learned the testosterone level in the baby9 ^$ N6 H% H; t( @' y8 L
was high, he then read the product information3 F* k" B+ m9 k2 t
packet and concluded that it was most likely the rea-
- D( i$ i& e( B( b, Nson for the child’s virilization. At that time, they/ b; E F. p9 _' J6 d( s. D+ h
decided to put the baby in a separate bed, and the
& b8 O4 c+ l/ ofather was not hugging him with bare skin and had. E+ ]& n. [* ]# F
been using protective clothing. A repeat testosterone
5 Z8 E" `& \3 Ztest was ordered, but the family did not go to the
8 @6 t; w) V" a1 `6 X; V, Plaboratory to obtain the test.( h9 D, [3 w5 _
Discussion0 y# }0 S5 ^, P8 L( R
Precocious puberty in boys is defined as secondary
& N4 M( a" ]; x0 b! q. a/ w. Hsexual development before 9 years of age.1,4
* t9 g1 }! c( t) ePrecocious puberty is termed as central (true) when5 v$ }% c' d! y7 U. G& O. {
it is caused by the premature activation of hypo-) D% w) X& o* d' J
thalamic pituitary gonadal axis. CPP is more com-
L9 X \; R+ i4 z+ `) Pmon in girls than in boys.1,3 Most boys with CPP% N/ \1 t' f0 [' g4 ~' I
may have a central nervous system lesion that is
5 p$ G5 h4 s$ f3 o) L; n( `responsible for the early activation of the hypothal-1 G: ?" m. I: |: B
amic pituitary gonadal axis.1-3 Thus, greater empha-
$ ]2 s3 h$ H& Rsis has been given to neuroradiologic imaging in/ V2 [% x& P! e+ b
boys with precocious puberty. In addition to viril-: X% L0 ^7 _# Z# C! ~
ization, the clinical hallmark of CPP is the symmet-) u$ }+ C+ D2 R+ J/ J
rical testicular growth secondary to stimulation by
9 w2 _6 G0 V% J$ b# ~9 ugonadotropins.1,3/ }3 h4 Z) ~! K W3 Y- V8 y5 c
Gonadotropin-independent peripheral preco-1 R7 t. G, s' Y! s _% C. l
cious puberty in boys also results from inappropriate
5 S) T4 u! n1 U5 Yandrogenic stimulation from either endogenous or- S* `. Q, \) i4 ?- i8 V& [
exogenous sources, nonpituitary gonadotropin stim-' l! K8 T# G9 ]% Q+ F
ulation, and rare activating mutations.3 Virilizing
1 f2 m6 t1 i" i" Mcongenital adrenal hyperplasia producing excessive
( \+ _% v# b9 e3 `! V4 Xadrenal androgens is a common cause of precocious
$ b; L. i& K* x8 T! ^! h0 kpuberty in boys.3,4
1 n( ^ Q3 L; X5 I& }The most common form of congenital adrenal
' S% p; y& R! Chyperplasia is the 21-hydroxylase enzyme deficiency.! _! B. e+ H3 a0 G' F% |) M
The 11-β hydroxylase deficiency may also result in
3 ^, B" B& n- m8 G' a" pexcessive adrenal androgen production, and rarely,
+ T. L! j, n4 R- h) \an adrenal tumor may also cause adrenal androgen. o, _ Q, e# ]) `) o) x. T1 o* f
excess.1,38 |8 ^6 A. Q- j8 H
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from: A0 t2 U7 X4 d6 L% b5 E, e, X
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007% _/ U* ~! B, F0 Y$ R/ [! k
A unique entity of male-limited gonadotropin-
9 j6 S6 y6 l- i Uindependent precocious puberty, which is also known* |( j) K2 B9 Y$ z
as testotoxicosis, may cause precocious puberty at a
' F; ]6 w% ?7 _, Y' @very young age. The physical findings in these boys
* q/ K% D8 k% O4 ]1 d) c% Kwith this disorder are full pubertal development,8 w! D1 g% g6 s% A* j
including bilateral testicular growth, similar to boys E3 s3 H+ t1 x9 |9 J! J
with CPP. The gonadotropin levels in this disorder# V7 p: J: X" G+ X7 @. k$ r
are suppressed to prepubertal levels and do not show
/ m, w' {- f; ^9 J0 Q3 a0 e. M7 Rpubertal response of gonadotropin after gonadotropin-! ~3 ?) N y, G+ U, p' P
releasing hormone stimulation. This is a sex-linked. y7 G" @- S" B% X& r5 Z. i. A
autosomal dominant disorder that affects only/ J4 U, ?$ [% L
males; therefore, other male members of the family5 L5 [5 E& R( H- f
may have similar precocious puberty.38 c: p7 F9 K, Q/ Q
In our patient, physical examination was incon- o4 h8 C' Q$ q1 |6 m4 v
sistent with true precocious puberty since his testi-, S4 g P4 S) E; O- E$ Z; F9 h, ]
cles were prepubertal in size. However, testotoxicosis
' t/ n, q/ i6 e! B; z4 p+ Qwas in the differential diagnosis because his father, g& E6 D4 l2 L! o- f' p9 c
started puberty somewhat early, and occasionally,$ y0 ~' M/ p) x+ o. l
testicular enlargement is not that evident in the
( g a! [7 B+ m7 ?beginning of this process.1 In the absence of a neg-, Y2 R' c/ M! [7 p) c0 E5 o+ @) B
ative initial history of androgen exposure, our+ ?! l, G/ H0 s+ C# I4 M8 t/ X
biggest concern was virilizing adrenal hyperplasia,2 d# s6 z$ U5 ~
either 21-hydroxylase deficiency or 11-β hydroxylase- X0 |3 ~9 j+ ?9 k* w
deficiency. Those diagnoses were excluded by find- H/ f- R+ N. u9 R5 f2 u2 h
ing the normal level of adrenal steroids.
% I; }. _" L. K2 OThe diagnosis of exogenous androgens was strongly
( T: N3 U$ t4 msuspected in a follow-up visit after 4 months because/ E2 u/ t8 R' i/ d: u( V, f# @' [
the physical examination revealed the complete disap-
. j- H0 `' g' c, n! v" ~4 ?pearance of pubic hair, normal growth velocity, and/ I% f# x0 i& T5 ^6 O
decreased erections. The father admitted using a testos-1 N: p' |1 Q( F' [
terone gel, which he concealed at first visit. He was1 H" f7 p" L5 F! y4 c3 B
using it rather frequently, twice a day. The Physicians’
/ X1 G2 L3 K. q9 \. hDesk Reference, or package insert of this product, gel or
0 I- ~; {3 K. e o, Z# `' c Qcream, cautions about dermal testosterone transfer to
) E3 g$ }' e2 ?! v- @. sunprotected females through direct skin exposure.
# S5 V4 x P! ?1 O) _Serum testosterone level was found to be 2 times the
9 P% e8 A" v$ [# @' w4 ?8 ]+ g: }baseline value in those females who were exposed to8 J, h8 r) s% E3 H
even 15 minutes of direct skin contact with their male
; U8 O! z% S/ ?, |4 bpartners.6 However, when a shirt covered the applica-
' @+ Q- b6 Q* @) x( Z a5 E) u, dtion site, this testosterone transfer was prevented.3 E$ ?: w+ O1 N" n
Our patient’s testosterone level was 60 ng/mL,
E: S% x5 `1 y5 H3 }& c6 \) g4 O6 wwhich was clearly high. Some studies suggest that
! h# F3 o9 B8 V2 h. o' }$ g+ w( b1 vdermal conversion of testosterone to dihydrotestos-8 c M7 k! w1 m+ Y
terone, which is a more potent metabolite, is more
) N1 | j1 _3 @( }3 sactive in young children exposed to testosterone
: _6 L g# |3 Y! ^! i4 nexogenously7; however, we did not measure a dihy-
3 O/ P, ~0 b9 f0 s/ w0 J- B4 gdrotestosterone level in our patient. In addition to% ?, e: N5 @8 i( _- k
virilization, exposure to exogenous testosterone in+ o! F4 z0 g2 {' q) k: L
children results in an increase in growth velocity and s+ f0 O6 G9 d6 Q/ _2 D) z2 H
advanced bone age, as seen in our patient.& F7 R" u" p2 m8 n: ? q
The long-term effect of androgen exposure during$ S R/ |9 m. A# W; K4 B
early childhood on pubertal development and final
% o( {- P; m# g# j2 G, Gadult height are not fully known and always remain
$ B8 C/ Y7 e9 [/ \a concern. Children treated with short-term testos-
2 l* h0 r3 H! z! y" j8 m4 @& o4 A, q3 |terone injection or topical androgen may exhibit some
" p" X. k2 X3 Eacceleration of the skeletal maturation; however, after8 `5 X! j" e. `8 C5 `( U
cessation of treatment, the rate of bone maturation4 K/ ^ c0 _* C
decelerates and gradually returns to normal.8,9, H- j' b' i F6 i; g+ q5 S+ k
There are conflicting reports and controversy; p, z& a ]/ X# J! P6 K9 p
over the effect of early androgen exposure on adult
) J3 |, i1 }" X7 H X0 W; v, ^! ~penile length.10,11 Some reports suggest subnormal: \* R/ v; g& r8 ?# Y: }6 g+ M" R: E3 d, B
adult penile length, apparently because of downreg-
8 K3 j2 P& I( w2 Dulation of androgen receptor number.10,12 However,
2 j/ L" n1 B, W& QSutherland et al13 did not find a correlation between
) x4 T6 G6 s, u- `" F' d! Qchildhood testosterone exposure and reduced adult9 ~; y2 d6 s& V: K2 h( U- \8 X
penile length in clinical studies.
4 T3 v7 A7 R( U- eNonetheless, we do not believe our patient is
4 ~) o1 t% Y' V8 K$ _! x Rgoing to experience any of the untoward effects from
. \" R1 l1 F/ E+ F: N; Ltestosterone exposure as mentioned earlier because1 X. j. C8 Q- N7 } h* t
the exposure was not for a prolonged period of time.7 B: [% P( t2 U3 }9 v% j
Although the bone age was advanced at the time of- |0 j$ o' q9 H
diagnosis, the child had a normal growth velocity at
# j& D( U0 L6 W# T. }the follow-up visit. It is hoped that his final adult
3 s! i& O4 M R5 \' b: {height will not be affected.
7 J( Q/ f* N6 P2 t2 N) {Although rarely reported, the widespread avail-
- J+ w7 V, R. L- J" H7 ?" [$ @, ]+ Aability of androgen products in our society may# ]# s' t" A* A
indeed cause more virilization in male or female! C9 c) \* V6 u* l `
children than one would realize. Exposure to andro-' b. o! O+ h, r2 p, ?/ H
gen products must be considered and specific ques-
( s( D3 B3 J9 f* t' F. Jtioning about the use of a testosterone product or% A' v+ ]1 E! E3 \
gel should be asked of the family members during
& r. _/ ]! b% ^7 ^, }the evaluation of any children who present with vir-
& p" R# N* y7 k8 |/ ]7 z) pilization or peripheral precocious puberty. The diag-
8 q1 N8 d& \( y; t$ y! i- ~nosis can be established by just a few tests and by
, `* Y- v- }# @0 Bappropriate history. The inability to obtain such a/ Z/ S7 t/ \+ B
history, or failure to ask the specific questions, may
( n& L" n0 c1 M7 i( S6 fresult in extensive, unnecessary, and expensive
3 N: t2 t! \6 rinvestigation. The primary care physician should be
8 u6 F% J5 p" {7 C, e; waware of this fact, because most of these children
3 p% d* P5 D. umay initially present in their practice. The Physicians’. O# N0 h7 u, N. \
Desk Reference and package insert should also put a
2 [1 T1 j' f( g% v2 r6 g% X, iwarning about the virilizing effect on a male or
3 T [) T. W$ L/ Ifemale child who might come in contact with some-
1 f( J0 e% a: k7 Cone using any of these products." E8 o( E* L3 B
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Stanford, CA: Stanford University Press; 1959.
* H/ T; e! d7 p1 \9 a# Z( J* V; {6. Physicians’ Desk Reference. Androgel 1% testosterone,
9 w5 N0 V/ F$ [0 D+ xUnimed Pharmaceutical Inc. Montvale, NJ: Medical
" B, Z$ D; k! Q( z dEconomics Company, Inc; 2004:3239-3241.
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